Collecting explicite information on some BMW E46 M3 engine install.
We suspect that ECU has HALL primtrig input and VR primtrig sensor is actually used
- but uncertainty about trigger, and serialnr (specified but almost certainly wrong)...
Not specifying (=> guessing) trigger type or falsely specifying serialnr (=>guessing) ECU serialnr (or, in this case both :-) makes support impossible.
Be exact about the sensor type, measurement details so practical advice can be formed and support can be attempted.
Primary trigger ... VR or HALL ?
Check basic things
If VR:
- measure VR sensor resistance (expected: 400..1400 Ohm)
- also measure (with ECU disconnected) between EC36/pin27 and EC36/pin26: is resistance the same ?
- with ECU powered and sensor connected: measure DC voltage on EC36/27 (expect +150..250mV)
- with primtrig disconnected, and 1k between EC36/27 and GND 0.15 .. 0.25V expected
If HALL trigger:
- measure HALL supply DC voltage (usually +5V, rarely +12V)
- optional (note): HALL supply current is usually 6..15mA
- please measure EC36/27 voltage with sensor disconnected (expect >4V)
- and with a 1k between primtrig sensor and GND (0.8 .. 1.5V expected).
- If not good: apply a 4k7 .. 6k8 "pullup" resistor between signal and +5V and repeat measurement.
- can you scope EC36/27 HALL signal ? 0.5V / 4V or similar ?
I hope that helps, we can continue with some useful input.
In anything trigger related the trigger type is important to mention. A working HALL sensor is used ? v3/10112 has HALL/HALL inputs and it will NOT work with VR sensor (as suspected to be the case); the spare ECU might have VR input and that explains why it works.
In VT report v3/10172 is explicitely mentioned (but probably wrong), it seems false. We think from the log filename the ECU is likely
v3/10112 (from oid10258):
1 x ECU VEMS V3
- withSDcard: no
- Service: normal
- secondary_trigger: HALL
- primary_trigger: HALL
- mounting-style: flanged case
- MAP connection: 300 kPa simplenipple
- LCD connection: no
- Knock input channels: 1
- ignition driver: 8
- Flyback: HighZ-only 30V flyback
- EGT input: no
- 1-wire interface: no
Note : 10172 was FALSE most likely, but v3/10172 from OID10493 has VR !!!! :
1 x ECU VEMS V3
- 1-wire interface: no
- EGT input: 1
- Flyback: HighZ-only 30V flyback
- ignition driver: 8
- Knock input channels: 2
- LCD connection: no
- MAP connection: 300 kPa simplenipple
- mounting-style: flanged case
- primary_trigger: EC36/27 VR
- secondary_trigger: EC36/13VR